Strange behaviour in male convict cichlid.

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falcon1

Feeder Fish
MFK Member
Feb 1, 2014
18
0
0
Canada
Other fish in the aquarium: Female convict cichlid, two offspring, both near maturity, though one seems to have a case of dwarfism and is tiny, though 6 months old. Two danios, one giant one regular. One striped Raphael catfish.

None of these fish fight with one another, not even a bit.

Tank size: 40 gallons

Possible causes: Tank was swept with a case of ich, or some other external parasite. 4 danios died, two regular and two giants. The male in question was infected, but shook it off with meds and time. Also I understand striped Raphael catfish carry poison in their spines. Maybe an encounter during a spawn ended poorly?

Symptoms: I noticed him swimming funny about a month ago. He was quite clumsy, and getting caught in the current would flip him on his side or upend him. Recently, I was able to determine why he was so uncontrolled in the water. His rear quarter-third of his body seems paralyzed. He does not use his tail to swim. His tail fin and the rear portion of his dorsal fin look sickly, and are held rigid. One of his offspring is a fantastic specimen, and has a long trailing dorsal fin, just as his father did, though the father's (male in question) is now cropped short, though it isn't ragged like you would expect with fin nipping. He swims with his pectorals, in the manner of a puffer. He still eats a healthy amount, just takes time retrieving the food.

Any ideas? Thanks
 
Back injury? Or maybe he got startled or chased something and bashed his head on decor? I've never really heard of partial fish paralysis, I would look more into the striped raph poison. I might do that now seeing as I have one and I wasn't aware of that haha

Has he been netted recently?

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No he has been left alone by me since I got him. I'm not sure if he is actually paralyzed per se, as when startled he does use his tail, but it is more of a vibrating motion than a normal swimming motion. I can't tell if he is actually using muscles in his tail or not when he does it but he still doesn't move very fast like that.

He was never a very bold fish, the female wore the pants in their relationship, but he spends a fair bit of time hiding now, more than before, and rarely strays from the vicinity of a hiding place.
 
An update on the poison...

I used to have an Oscar in with the catfish. He wasn't keen on sharing the tank, and one day bit the catfish, which responded by sticking him in the side with a spine. The Oscar was small enough at the time to hide in a couple ornaments, and I did not see him for the redo of the day. The Oscar never disagreed with the catfish again, and usually gave it a wide berth. This event came up in a conversation with a pet store worker, of whom I trust and she said that striped raphaels like most catfish carry a poison in their spines, which cause a lot of pain, and swelling. This has been confirmed by a quick google search.

The only way the catfish could cause permanent damage like this then is if he hit the spinal cord, which I think is unlikely. I think this has to be something else.
 
Hmm when you say the female wears the pants, does she beat up on him?

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Haha no the male has always been a wuss and she just never really was. In the wild those two would have never had a successful brood as at the first sign of a predator the male would just leave. The female has way more balls than him.
 
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